Update #2: GBA4iOS is once again available to new users. However, do to the fact the new (possibly temporary) host site is a rom site, I cannot provide a link here. But google "GBA4iOS download" and I'm sure you'll find it pretty easily.

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Edit: Link added. Also after reading the DMCA notice the dev got, particularly the part I'll paste below, it makes me wonder. If the app did not have a built in browser for downloading roms, would Nintendo still have taken action?

Originally Posted by Nintendo of America

This website hosts a downloadable mobile application for iOS that provides users with access to unauthorized and illegal copies of Nintendo&rsquo;s copyright-protected video games in violation of Nintendo&rsquo;s exclusive rights.

The way that part that I've bolded is worded makes it sound as if it's the fact the app has downloading of games built that caused the DMCA notice. So if he didn't have the built in browser/downloader, I have to wonder if Nintendo would have been able to have it shut down?